US PATENT SUBCLASS 251 / 194
.~.~ Screw sole actuator of expander and valve

Current as of: June, 1999
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251 /   HD   VALVES AND VALVE ACTUATION

157  DF  WITH MEANS TO INCREASE HEAD AND SEAT CONTACT PRESSURE {8}
193  DF  .~ Gate valve {3}
194.~.~ Screw sole actuator of expander and valve

DEFINITION

Classification: 251/194

(under subclass 193) Devices comprising a screw actuator so associated with the valve faces and the means to press them to their seats that it alone causes relative movement of them.